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C# is one of the family of languages Microsoft has designed to be part of its .NET framework.This paper gives a comprehensive introduction to C#, but before we start it is necessary tooutline some of the .NET concepts that will underpin the discussion in this paper. C# is part of the .NET Common Language Infrastructure (CLI). The CLI is a framework thatenables the multiple .NET languages to talk to each other, and is specifically designed forstrongly types languages. The CLI is comprised of the Common Intermediate Language (CIL) – a common machineindependent language into which all .NET applications are “compiled”, the Common TypeSystem (CTS) – a set of types that can be used interchangeably between the .NET languages,and the Virtual Execution System (VES) – which just-in-time compiles the CIL into nativeassembly code. The complete set of rules that enable all .NET language to talk to each other iscalled the Common Language System (CLS). A compiled C# program also contains a block of metadata (data about the program itself)called a manifest. This metadata allows reflection and effectively eliminates the need for theregistry.